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Why did Rails4 drop support for “assets” group in the Gemfile

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What is the purpose of “!” and “?” at the end of method names?

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Why does String.valueOf(null) throw a NullPointerException?

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Generating PDF files with JavaScript

...) doc.text('Hello world!', 10, 10) doc.save('a4.pdf') <script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.3.5/jspdf.debug.js"></script> share | improve this answer ...
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Is it wrong to use Deprecated methods or classes in Java?

...ay cease to exist in a future version. From the how-and-when to deprecate guide: You may have heard the term, "self-deprecating humor," or humor that minimizes the speaker's importance. A deprecated class or method is like that. It is no longer important. It is so unimportant, in fact, that you sh...
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How can you get the Manifest Version number from the App's (Layout) XML variables?

... value to the xml resources at compile time. Example Code extracted from: https://medium.com/@manas/manage-your-android-app-s-versioncode-versionname-with-gradle-7f9c5dcf09bf buildTypes { debug { versionNameSuffix ".debug" resValue "string", "app_version", "${defaultConfig.vers...
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Django REST framework: non-model serializer

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How can we programmatically detect which iOS version is device running on? [duplicate]

...l answer: Check iPhone iOS Version) Those macros do exist in github, see: https://github.com/carlj/CJAMacros/blob/master/CJAMacros/CJAMacros.h Like this: #define SYSTEM_VERSION_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrdere...
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How to create your own library for Android development to be used in every program you write?

...wanted to use the Pull To Refresh library by Chrisbanes at Github.com here https://github.com/chrisbanes/Android-PullToRefresh/tree/master/library. The library's structure is in the form of an Android app. It has the form like below: res/ src/ AndroidManifest.xml pom.xml project.properties How to...
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The type 'string' must be a non-nullable type in order to use it as parameter T in the generic type

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